Fix type in method name get_schema
Fix type in method name get_schema

This patch fixes a type in the method name get_schema which prevented
congress from starting if the cinder driver was loaded.

Change-Id: Iad851202ed9b35f81c05016d2060df1eb2cae203
Closes-bug: 1385824

openstack/congress,ramineni/my_congress,ramineni/my_congress,openstack/congress,ramineni/my_congress,ekcs/congress,ekcs/congress,ramineni/my_congress,ekcs/congress,ekcs/congress